<script setup>
import {ref, watch} from "vue";
import {useMouseInElement} from "@vueuse/core";

const props = defineProps({
  imageList:{
    type:Array
  }
})

const imageList = props.imageList

const curIndex = ref(0)
const target = ref(null)
const { elementX, elementY, isOutside } = useMouseInElement(target)

const left = ref(0)
const top = ref(0)
const positionX = ref(0)
const positionY = ref(0)

watch([elementX, elementY, isOutside],() => {
  // 鼠标不在盒子里不执行
  if (isOutside.value) return
  // 横向
  if (elementX.value > 100 && elementX.value < 300) {
    left.value = elementX.value -100
  }
  // 纵向
  if (elementY.value > 100 && elementY.value < 300) {
    top.value = elementY.value - 100
  }
  // 判断边界
  if (elementX.value > 300) left.value = 200
  if (elementX.value < 100) left.value = 0

  if (elementY.value > 300) top.value = 200
  if (elementY.value < 100) top.value = 0

  // 控制大图显示
  positionX.value = -left.value * 2
  positionY.value = -top.value * 2

})

const mouseEnterFn = (i) => {
  curIndex.value = i
}
</script>

<template>
  <div class="goods-image">
    <div class="middle" ref="target">
      <img :src="imageList[curIndex]" alt="">
      <div class="layer" :style="{left:`${left}px`,top:`${top}px`}" v-show="!isOutside"></div>
    </div>
    <ul class="small">
      <li v-for="(img,i) in imageList"
          :key="i"
          @mouseenter="mouseEnterFn(i)"
          :class="{active: i === curIndex }"
      >
        <img :src="img" alt="">
      </li>
    </ul>

    <div class="large"
         :style="[{
         backgroundImage:`url(${imageList[curIndex]})`,
         backgroundPositionX:`${positionX}px`,
         backgroundPositionY:`${positionY}px`,
       }]"
      v-show="!isOutside"
    >

    </div>
  </div>

</template>

<style scoped lang="scss">
.goods-image {
  width: 480px;
  height: 400px;
  position: relative;
  display: flex;

  .middle {
    width: 400px;
    height: 400px;
    background-color: #f5f5f5;

    .layer {
      width: 200px;
      height: 200px;
      background:rgba(0,0,0,0.2);
      left: 0;
      top: 0;
      position: absolute;
    }
  }

  .large {
    position: absolute;
    top: 0;
    left: 412px;
    width: 400px;
    height: 400px;
    z-index: 500;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
    background-repeat: no-repeat;
    background-size: 800px 800px;
    background-color: #f8f8f8;
  }
  .small {
    li {
      height: 68px;
      width: 68px;
      margin-left: 12px;
      margin-bottom: 15px;
      cursor: pointer;

      &:hover,
      &.active {
        border: 2px solid $xtxColor;
      }
    }
  }


}
</style>